*** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.dl.ac.uk/CCP/CCP4/main.html *** You've made a ccp4 map rather than a ccp4 mask. Covert it using mapmask mapin my.msk mskout mymask.msk < /dev/null It works for solvent masks because dm accepts multi-level solvent masks which are written as maps. Kevin